Spring mvc中有哪些处理请求和响应相关的注解呢?
下文笔者将讲述Spring mvc中请求和响应常用注解的简介说明,如下所示:
@Controller
默认返回 templates 目录下的 string.html 页面内容。 在方法中加上 @ResponseBody 注解,可以返回JSON、XML或自定义mediaType的内容
@RestController
直接返回内容,会自动将对象实体转换为JSON格式,视图解析器 InternalResourceViewResolver 不起作用。 @RestController = @Controller + @ResponseBody
@RequestBody
接收请求体中的 JSON 数据,通过实体类的setter方法赋值给属性。 json 的 "" => 实体 String 为 "" json 的 "" => 实体 Integer、Double 为 null json 的 null => 实体为 null @RequestBody 可以与 @RequestParam() 同时使用,@RequestBody 最多只能有一个,@RequestParam() 可以有多个。 以 String 接收数据 @RequestMapping("/index") public String indexMapping(@RequestBody String jsonStr) { return jsonStr; } 以对象实体接收数据 // {"name":"java","age":5} @RequestMapping("/index") public String indexMapping(@RequestBody User user) { return user.toString(); } 以复杂的对象实体接收数据 public class Team { private Integer id; private String name; private list<String> honors; private List<User> members; } // { // "id": 1, // "name": "other", // "honors": ["other123", "other889"], // "members": [{"name":"java265.com","age":5}, // {"name":"maomao365.com","age":9}], // } @RequestMapping("/index") public String indexMapping(@RequestBody Team team) { return team.toString(); } @ResponseBody 将对象实体转换为JSON、XML或自定义mediaType的内容,并在 HTTP response body 中返回
@RequestMapping
将请求映射到控制器上,可以在控制器类和/或方法上使用。 处理单个请求 @RequestMapping("/home") public class IndexController { @RequestMapping("/index") String indexMapping() { return "Hello from index mapping."; } } 处理多个请求 @RequestMapping("/home") public class IndexController { @RequestMapping(value = { "/", "/index", "/index/*.html", "/index/**/*.html" }) String indexMultipleMapping() { return "Hello from index multiple mapping."; } } 处理请求类型 默认是 HTTP GET 类型的。 @RequestMapping(value = "/home", method = RequestMethod.GET) String get() {} @RequestMapping(value = "/home", method = RequestMethod.DELETE) String delete() {} @RequestMapping(value = "/home", method = RequestMethod.POST) String post() {} @RequestMapping(value = "/home", method = RequestMethod.PUT) String put() {} @RequestMapping(value = "/home", method = RequestMethod.PATCH) String patch() {} 处理请求类型快捷方式 @GetMapping(value = "/home") String get() {} @DeleteMapping(value = "/home") String delete() {} @PostMapping(value = "/home") String post() {} @PutMapping(value = "/home") String put() {} @PatchMapping(value = "/home") String patch() {} 处理生产和消费对象 public class IndexController { // 生产 application/JSON 响应 @RequestMapping(value = "/prod", produces = { "application/JSON" }) @ResponseBody String getProduces() { return "Produces attribute"; } // 消费 application/JSON & application/XML 请求 @RequestMapping(value = "/cons", consumes = { "application/JSON", "application/XML" }) @ResponseBody String getConsumes() { return "Consumes attribute"; } } 处理消息头 public class IndexController { // 处理 Content-Type=application/json 的请求 @RequestMapping(value = "/head", headers = { "Content-Type=application/json" }) String head() { return "Mapping applied along with headers"; } } public class IndexController { @RequestMapping(value = "/head", headers = { "Content-Type=text/plain", "Content-Type=application/json" }) String head() { return "Mapping applied along with headers"; } } 处理请求参数 public class IndexController { @RequestMapping(value = "/fetch", params = { "personId=10" }) String getParams10(@RequestParam("personId") String id) { return "Fetched parameter using params attribute = " + id; } @RequestMapping(value = "/fetch", params = { "personId=20" }) String getParams20(@RequestParam("personId") String id) { return "Fetched parameter using params attribute = " + id; } } 处理动态 URI public class IndexController { @RequestMapping(value = "/fetch/{id}") String getDynamicUriValue(@PathVariable String id) { return "Dynamic URI parameter fetched"; } @RequestMapping(value = "/fetch/{id:\d+}/{name}") String getDynamicUriValueRegex( @PathVariable("id") int id, @PathVariable("name") String name ) { return "Dynamic URI parameter fetched using regex"; } } 默认的处理方法 public class IndexController { @RequestMapping() String default () { return "This is a default method for the class"; } }
版权声明
本文仅代表作者观点,不代表本站立场。
本文系作者授权发表,未经许可,不得转载。